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lib/haxebullet/bullet/BulletCollision/Gimpact/btGImpactMassUtil.h

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+/*! \file btGImpactMassUtil.h
+\author Francisco Leon Najera
+*/
+/*
+This source file is part of GIMPACT Library.
+
+For the latest info, see http://gimpact.sourceforge.net/
+
+Copyright (c) 2007 Francisco Leon Najera. C.C. 80087371.
+email: projectileman@yahoo.com
+
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it freely,
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+
+#ifndef GIMPACT_MASS_UTIL_H
+#define GIMPACT_MASS_UTIL_H
+
+#include "LinearMath/btTransform.h"
+
+
+
+SIMD_FORCE_INLINE btVector3 gim_inertia_add_transformed(
+	const btVector3 & source_inertia, const btVector3 & added_inertia, const btTransform & transform)
+{
+	btMatrix3x3  rotatedTensor = transform.getBasis().scaled(added_inertia) * transform.getBasis().transpose();
+
+	btScalar x2 = transform.getOrigin()[0];
+	x2*= x2;
+	btScalar y2 = transform.getOrigin()[1];
+	y2*= y2;
+	btScalar z2 = transform.getOrigin()[2];
+	z2*= z2;
+
+	btScalar ix = rotatedTensor[0][0]*(y2+z2);
+	btScalar iy = rotatedTensor[1][1]*(x2+z2);
+	btScalar iz = rotatedTensor[2][2]*(x2+y2);
+
+	return btVector3(source_inertia[0]+ix,source_inertia[1]+iy,source_inertia[2] + iz);
+}
+
+SIMD_FORCE_INLINE btVector3 gim_get_point_inertia(const btVector3 & point, btScalar mass)
+{
+	btScalar x2 = point[0]*point[0];
+	btScalar y2 = point[1]*point[1];
+	btScalar z2 = point[2]*point[2];
+	return btVector3(mass*(y2+z2),mass*(x2+z2),mass*(x2+y2));
+}
+
+
+#endif //GIMPACT_MESH_SHAPE_H